106 lines
1.9 KiB
C
106 lines
1.9 KiB
C
/****************************************************************
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* *
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* Copyright 2001, 2007 Fidelity Information Services, Inc *
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* *
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* This source code contains the intellectual property *
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* of its copyright holder(s), and is made available *
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* under a license. If you do not know the terms of *
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* the license, please stop and do not read further. *
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* *
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****************************************************************/
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#include "mdef.h"
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#include "stpg_sort.h"
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#define S_CUTOFF 15
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/* stpg_sort sorts an array of pointers to mstr's using the value
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of each mstr's addr field as the key. The algorithm is a modified
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QuickSort algorithm.
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*/
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void stpg_sort (mstr **base, mstr **top)
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{
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mstr **stack[50], ***sp;
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mstr *v, *t;
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mstr **l, **r;
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mstr **ix, **jx, **kx;
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char *tval;
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sp = stack;
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l = base;
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r = top;
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for (;;)
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{
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if (r - l < S_CUTOFF)
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{
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for (ix = l + 1; ix <= r; ix++)
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{
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for (jx = ix, t= *ix, tval = t->addr; jx > l && (*(jx - 1))->addr > tval; jx--)
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{
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*jx = *(jx - 1);
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}
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*jx = t;
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}
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if (sp <= stack)
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{
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break;
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}
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else
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{
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l = *--sp;
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r = *--sp;
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}
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}
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else
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{
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ix = l;
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jx = r;
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kx = l + ((int)(r - l) / 2);
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kx = ((*ix)->addr > (*jx)->addr) ?
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(((*jx)->addr > (*kx)->addr) ?
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jx :
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(((*ix)->addr > (*kx)->addr) ? kx : ix)) :
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(((*jx)->addr < (*kx)->addr) ?
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jx :
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(((*ix)->addr > (*kx)->addr) ? ix : kx));
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v = *kx;
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*kx = *jx;
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*jx = v;
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tval = v->addr;
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ix--;
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do
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{
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do
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{
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ix++;
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} while ((*ix)->addr < tval);
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do
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{
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jx--;
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} while ((*jx)->addr > tval);
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t = *ix;
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*ix = *jx;
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*jx = t;
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} while (jx > ix);
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*jx = *ix;
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*ix = *r;
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*r = t;
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if (ix - l > r - ix)
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{
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*sp++ = ix - 1;
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*sp++ = l;
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l = ix + 1;
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}
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else
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{
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*sp++ = r;
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*sp++ = ix + 1;
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r = ix - 1;
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}
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}
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}
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return;
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}
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